Add interstitial for Terms of Service updates (#34527)

app/controllers/concerns/web_app_controller_concern.rb

@@ -8,6 +8,7 @@ module WebAppControllerConcern
 
     before_action :redirect_unauthenticated_to_permalinks!
     before_action :set_referer_header
+    before_action :redirect_to_tos_interstitial!
 
     content_security_policy do |p|
       policy = ContentSecurityPolicy.new
@@ -45,6 +46,13 @@ module WebAppControllerConcern
 
   protected
 
+  def redirect_to_tos_interstitial!
+    return unless current_user&.require_tos_interstitial?
+
+    @terms_of_service = TermsOfService.published.first
+    render 'terms_of_service_interstitial/show', layout: 'auth'
+  end
+
   def set_referer_header
     response.set_header('Referrer-Policy', Setting.allow_referrer_origin ? 'strict-origin-when-cross-origin' : 'same-origin')
   end